Better define count method

src/example/java/it.cavallium.dbengine.client/SpeedExample.java

@@ -302,7 +302,7 @@ public class SpeedExample {
 				numRepeats,
 				tuple -> Mono
 						.fromRunnable(() -> System.out.println("Calculating size"))
-						.then(tuple.getT2().size(null, false))
+						.then(tuple.getT2().leavesCount(null, false))
 						.doOnNext(s -> System.out.println("Size after: " + s))
 						.then(tuple.getT1().close())
 		);
@@ -400,7 +400,7 @@ public class SpeedExample {
 				numRepeats,
 				tuple -> Mono
 						.fromRunnable(() -> System.out.println("Calculating size"))
-						.then(tuple.getT2().size(null, false))
+						.then(tuple.getT2().leavesCount(null, false))
 						.doOnNext(s -> System.out.println("Size after: " + s))
 						.then(tuple.getT1().close())
 		);
@@ -429,7 +429,7 @@ public class SpeedExample {
 				numRepeats,
 				tuple -> Mono
 						.fromRunnable(() -> System.out.println("Calculating size"))
-						.then(tuple.getT2().size(null, false))
+						.then(tuple.getT2().leavesCount(null, false))
 						.doOnNext(s -> System.out.println("Size after: " + s))
 						.then(tuple.getT1().close())
 		);

src/main/java/it/cavallium/dbengine/database/collections/DatabaseMapDictionary.java

@@ -87,7 +87,7 @@ public class DatabaseMapDictionary<T, U> extends DatabaseMapDictionaryDeep<T, U,
 	}
 
 	@Override
-	public Mono<Long> size(@Nullable CompositeSnapshot snapshot, boolean fast) {
+	public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
 		return dictionary.sizeRange(resolveSnapshot(snapshot), range, fast);
 	}
 

src/main/java/it/cavallium/dbengine/database/collections/DatabaseMapDictionaryDeep.java

@@ -174,6 +174,11 @@ public class DatabaseMapDictionaryDeep<T, U, US extends DatabaseStage<U>> implem
 		return LLRange.of(first, end);
 	}
 
+	@Override
+	public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
+		return dictionary.sizeRange(resolveSnapshot(snapshot), range, fast);
+	}
+
 	@SuppressWarnings("ReactiveStreamsUnusedPublisher")
 	@Override
 	public Mono<US> at(@Nullable CompositeSnapshot snapshot, T keySuffix) {

src/main/java/it/cavallium/dbengine/database/collections/DatabaseSingle.java

@@ -54,7 +54,7 @@ public class DatabaseSingle<U> implements DatabaseStageEntry<U> {
 	}
 
 	@Override
-	public Mono<Long> size(@Nullable CompositeSnapshot snapshot, boolean fast) {
+	public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
 		return dictionary
 				.isRangeEmpty(resolveSnapshot(snapshot), LLRange.single(key))
 				.map(empty -> empty ? 0L : 1L);

src/main/java/it/cavallium/dbengine/database/collections/DatabaseSingleMapped.java

@@ -68,8 +68,8 @@ public class DatabaseSingleMapped<U> implements DatabaseStageEntry<U> {
 	}
 
 	@Override
-	public Mono<Long> size(@Nullable CompositeSnapshot snapshot, boolean fast) {
+	public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
-		return serializedSingle.size(snapshot, fast);
+		return serializedSingle.leavesCount(snapshot, fast);
 	}
 
 	@Override

src/main/java/it/cavallium/dbengine/database/collections/DatabaseStage.java

@@ -41,9 +41,14 @@ public interface DatabaseStage<T> extends DatabaseStageWithEntry<T> {
 		return Mono.empty();
 	}
 
-	Mono<Long> size(@Nullable CompositeSnapshot snapshot, boolean fast);
+	/**
+	 * Count all the elements.
+	 * If it's a nested collection the count will include all the children recursively
+	 * @param fast true to return an approximate value
+	 */
+	Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast);
 
 	default Mono<Boolean> isEmpty(@Nullable CompositeSnapshot snapshot) {
-		return size(snapshot, false).map(size -> size <= 0);
+		return leavesCount(snapshot, false).map(size -> size <= 0);
 	}
 }

src/main/java/it/cavallium/dbengine/database/collections/DatabaseStageMap.java

@@ -136,7 +136,7 @@ public interface DatabaseStageMap<T, U, US extends DatabaseStage<U>> extends Dat
 	}
 
 	@Override
-	default Mono<Long> size(@Nullable CompositeSnapshot snapshot, boolean fast) {
+	default Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
 		return getAllStages(snapshot).count();
 	}